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Today SORTHEAP and SHEAPTHRES_SHR need to be set to a fixed value to run BLU. The STMM tuned adjustment don't need to be highly sophisticated. E.g. keeping 60/40 ratio for bufferpool/sheapthres_shr and adjust sortheap as ratio taking the amount of concurrent workload into account should do the trick in most cases. It is acceptable that in case of SQL0955N (SORTHEAP overflow) a manual value gets set. And it is better to have a worse bufferpool hit ratio than failing queries. In any case this is what today's db admin perform manually.
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